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Figure 2-7
First LED Patterns
If the first LED pattern
displayed is...
0
1
2
3
NOTES
1. Second and third LED failure patterns:
0001 and 0001 for any main ROM failure
0001 and 0002 for boot ROM failure
2. Second and third LED failure patterns:
0001 and 0001 for Memory/SBRC board RAM failure
0001 and 0002 for Controller board RAM failure
3. Second and third LED failure patterns:
0001 and 0001 for Memory/SBRC board RAM failure
0001 and 0010 for Memory/SBRC board RAM failure
4. Second and third LED failure patterns for Control Interface:
0001 and 0001 for Serial Port 9 failure
0001 and 0010 for Serial Port 10 failure
0001 and 0011 for Serial Port 11 failure
0001 and 0100 for Serial Port 14 failure
0001 and 1101 for Parallel Port 15 failure
0001 and 1110 for Parallel Port 16 failure
Then the failure is...
Microprocessor
ROM Checksum (See note 1.)
RAM (See note 2.)
RAM (See note 3.)
Timer
Real-Time Clock
Keyboard (stuck key or faulty key-down detector)
Control Interface (See note 4.)
Serial Bus Communication (see
Signaling Board Self Test
Display Drive Self Test
Miscellaneous Hardware (see
Self-Test Diagnostics
LED Legend
= off
= rapid blink
= steady on or slow blink
figure 2-8 on page
figure 2-9 on page
57)
Troubleshooting
56)
55
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Table of Contents
Troubleshooting
